Apparatus and method for converting control information

ABSTRACT

Picture and speech communication between plural terminals connected to different networks, such as a circuit-switched network and IP network. A converting apparatus  400  for control information or media information for picture/speech communications is provided across first and second terminals  301, 302  connected to respective different types of networks. Converting apparatus  400  includes control information converter  420 , transcoder  450  and ability information converter  460 . In case the ability information extracted from the decoding information, received from the first terminal  301 , is not coincident to the ability information extracted from the call control information received from the second terminal  302 , it is further checked whether or not there is picture format size coincidence. If the picture format size coincidence persists in one direction, processing is carried out for converting part of the decoding information or the control information, without causing the operations of the transcoder. In case there is no picture format size coincidence, the transcoder  450  is booted to convert the bitstream.

FIELD OF THE INVENTION

This invention relates to an apparatus and a method for converting thecontrol information for picture/speech communication between pluralterminals connected to different types of networks, such ascircuit-switched network or IP network.

BACKGROUND OF THE INVENTION

In the JP Patent Kokai Publication No. JP-P2003-125367A, there isintroduced an instance of a multi-media communication terminal capableof performing multi-media communications by ITU-T (InternationalTelecommunication Union Telecommunication Standardization Sector)Recommendations H.263, retained to be indispensable in the multi-mediacommunication terminal standard 3G-324 of 3GPP (Third GenerationPartnership Project) as an picture encoding system, MPEG (Moving PictureExpert Group)-4, internationally standardized by the ISO (InternationalOrganization of Standardization)/IEC (International ElectrotechnicalCommission), AMR, retained to be indispensable in the 3G-324 as a speechencoding system, or by ITU-T Recommendations G723.1 etc.

[Patent Document 1]

JP Patent Kokai Publication No. JP-P2003-125367A

SUMMARY OF THE DISCLOSURE

However, if the terminals, as stated in the above Laid-Open PatentDocument, are connected to respective different types of networks, thecodecs mounted on the two terminals differ from each other, such that itis not possible for one of the terminals to decode the compressedstream, prepared on encoding for compression and sent by the counterpartside terminal, with the result that, in the absence of propercountermeasures, the picture/speech communication is not feasible.

After all, in the above-described case, there lacks a communication pathover which the control information for, e.g., the codecs, mounted on therespective terminals, may be transmitted between the two terminals, withthe result that the information as to which codec is mounted on any oneof the terminals cannot be communicated to a counterpart side terminal,and hence the communication cannot be carried out between the terminals.

In view of the above-depicted status of the art, it is an object of thepresent invention to provide an apparatus and a method whereby, in thepicture/speech information between the terminals connected to differenttypes of networks, such as circuit-switched network or IP network, thecontrol information may be converted for establishing the communicationeven in case the codec provided to one of the terminals differs fromthat provided to the counterpart side terminal.

In one aspect, the present invention provides an apparatus forconverting control information or media information for picture/speechcommunication between first and second terminals connected to respectivedifferent types of networks. The apparatus comprises a converter forconversion of the call control information (or the decodinginformation), attendant on the control information or the mediainformation. The converter effects converting processing (in the firstdirection) for converting decoding information (or call controlinformation) acquired from the first terminal belonging to one networkinto call control information (or decoding information) to output theresulting information to the second terminal belonging to the othernetwork. The converting apparatus also converts (in the seconddirection) the call control information (or the decoding information)acquired from the second terminal into the decoding information (or thecall control information) to output the resulting information to thefirst terminal.

In a second aspect, the present invention provides a method forconverting control information or media information for picture/speechcommunication between first and second terminals connected to respectivedifferent types of networks. With this method, a converting apparatus,which has acquired decoding information (or call control information)from the first terminal, converts decoding information (or call controlinformation) into the call control information (or the decodinginformation) to output the resulting information to the second terminal.On acquisition of call control information (or decoding information)from the second terminal, the converting apparatus converts the callcontrol information (or the decoding information) into decodinginformation (or call control information) to output the resultinginformation to the first terminal.

The meritorious effects of the present invention are summarized asfollows.

According to the present invention, communications can be establishedeven if, in the communications between terminals to be connected todifferent networks, such as between a mobile phone terminal and a SIP(Session Initiation Protocol) terminal, the ability information formatof one of the terminals differs from that of the other terminal.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing the configuration of a convertingapparatus for the control information according to a first embodiment ofthe present invention.

FIG. 2 is a block diagram showing the configuration of a convertingapparatus for the control information according to a second embodimentof the present invention.

FIG. 3 is a block diagram showing the configuration of a convertingapparatus for the control information according to a third embodiment ofthe present invention.

FIG. 4 is a block diagram showing the configuration of a convertingapparatus for the control information according to a fourth embodimentof the present invention.

FIG. 5 is a block diagram showing the configuration of a convertingapparatus for the control information according to a fifth embodiment ofthe present invention.

PREFERRED EMBODIMENTS OF THE INVENTION

Referring to the drawings, preferred embodiments of the presentinvention will be explained in detail. FIG. 1 depicts a block diagramshowing the configuration of an apparatus for converting the controlinformation according to a first embodiment of the present invention.Specifically, FIG. 1 shows a converting apparatus 110, arranged betweena first terminal 100 and a second terminal 150. In the following, it isassumed that the first terminal 100 is connected to a circuit-switchednetwork and the second terminal 150 is connected to an IP network.

The first terminal 100 is such a device which is supplied with movingpicture signals, compresses/encodes the moving picture signals, inaccordance with the DCI (Decoder Configuration Information) as set fromthe outset in a moving picture encoder, not shown, and outputs anencoded bit stream to the converting apparatus 110.

The first terminal 100 sends to the converting apparatus 110 decodinginformation, for example, the aforementioned DCI, mounted thereon andrepresenting the ability information of the codec pertinent to a streamthe first terminal can validly receive from the counterpart party.

On the other hand the second terminal 150 sends call controlinformation, representing the ability information of the codec mountedthereon, to the converting apparatus 110.

The converting apparatus 110 is, e.g,. a gateway device including afirst transmitting/receiving unit 120, a second transmitting/receivingunit 130 and a control information converter 115.

When the first transmitting/receiving unit 120 has received the decodinginformation and the bitstream from the first terminal 100, theconverting apparatus 110 allows the decoding information to be sent tothe control information converter 115.

The control information converter 115, which has acquired the decodinginformation, retrieves the ability information, for example, theaforementioned DCI, contained in the received decoding information, fromthe first terminal 100, using, e.g., the ITU-T standard H-245 protocol,and converts the so retrieved ability information into the descriptionof the SDP (Session Description Protocol), as prescribed in, forexample, the IETF RFC Recommendations RFC2327, to output the resultingcall control information to the second transmitting/receiving unit 130.This second transmitting/receiving unit 130 sends the call controlinformation to the second terminal 150.

The signal flow from the second terminal 150 towards the first terminal100 will now be explained. When the second transmitting/receiving unit130 has received call control information and a bitstream from thesecond terminal 150, the converting apparatus 110 allows the callcontrol information to be sent to the control information converter 115.

On acquisition of the call control information, the control informationconverter 115 extracts the ability information of the second terminal,such as the SDP information as set by IETF RFC, contained in the callcontrol information received from the second terminal 150, and convertsthe so extracted ability information into decoding information that canbe read/understood by the first terminal, such as the aforementionedDCI, to output the so produced decoding information to the firsttransmitting/receiving unit 120. This first transmitting/receiving unit120 sends the resulting decoding information to the first terminal 100.

Thus, even if, in the communication between two different networks, theformat of the ability information of one of two terminals involved inthe communication differs from that of the counterpart side terminal,such as when the format of one of the terminal is DCI and that of theother terminal is SDP, the communication may be established byinterposing the converting apparatus configured for converting thecontrol information.

A second embodiment of the present invention, realizing the abilityinformation negotiation between the two terminals, will now beexplained. The components of the second embodiment which are the same asthose of the first embodiment are omitted in the explanation forsimplicity. FIG. 2 depicts a block diagram showing the structure of aconverting apparatus for the control information according to the secondembodiment of the present invention. Referring to FIG. 2, there is showna converting apparatus 210 arranged between the first terminal 100 andthe second terminal 150. In the following explanation of the presentsecond embodiment, it is again assumed that the first terminal 100 isconnected to a circuit-switched network, while the second terminal 150is connected to an IP network.

The converting apparatus 210 is, e.g., a gateway device comprising afirst transmitting/receiving unit 120, a second transmitting/receivingunit 130 and a control information converter 215.

When the first transmitting/receiving unit 120 has received the decodinginformation and a bitstream from the first terminal 100, the convertingapparatus 210 allows the call control information to be sent to thecontrol information converter 215.

The control information converter 215 retrieves the ability information,such as DCI of the MPEF-4 standard, contained in the decodinginformation, received from the first terminal 100, and changes the soretrieved information into the description of, e.g., SDP prescribed inthe IETF RFC, by way of conversion into call control information, tooutput the so produced information to the second transmitting/receivingunit 130. This second transmitting/receiving unit 130 sends theresulting call control information to the second terminal 150.

The second terminal 150 extracts the ability information, set forth inthe description of the SDP, from the call control information, receivedfrom the second transmitting/receiving unit 130, and determines whetheror not the so extracted information contains the ability information thesecond terminal is able to receive. If the extracted informationcontains the ability information the second terminal 150 is able toreceive, the second terminal returns a response signal of that effect tothe converting apparatus 210. If the ability information, obtained fromthe call control information, does not contain the ability informationthe second terminal is able to receive, the second terminal returns anegative response.

If an affirmative response is received from the second terminal 150, thecontrol information converter 215 of the converting apparatus 210converts the affirmative response into a form that permits the firstterminal 100 to receive the response. The converting apparatus thensends the so produced affirmative response to the first terminal. By theabove processing, a negotiation of the ability information is carriedout between the second terminal 150 and the first terminal 100 (as awhole, generally, in the direction from the first to the secondterminal).

The negotiation of the ability information in a direction from thesecond terminal 150 to the first terminal 100 is carried out in asimilar manner to that in the direction from the first terminal 100towards the second terminal 150 described above.

Thus, even if, in the communication between two different networks, theformat of the ability information of one of two terminals involved inthe communication differs from that of the counterpart side terminal,such as when the format of the first-stated terminal is DCI and that ofthe second-stated terminal is SDP, the communication can be establishedby interposing the converting apparatus configured for converting thecontrol information.

A third embodiment of the present invention, including a converter(transcoder) in the converting apparatus, will now be explained. Thecomponents of the second embodiment which are the same as those of thefirst embodiment are omitted in the explanation for simplicity. FIG. 3depicts a block diagram showing the configuration of an apparatus forconverting the control information according to a third embodiment ofthe present invention. Specifically, FIG. 3 shows a converting apparatus300, arranged between a first terminal 301 and a second terminal 302. Inthe following explanation, it is again assumed that the first terminal301 is connected to a circuit-switched network and the second terminal302 is connected to an IP network.

The converting apparatus 300 includes a control information converter320, a transcoder 350, first transmitting/receiving units 120, 121 andsecond transmitting/receiving units 130, 131. The converting apparatus300 receives the decoding information, such as DCI of the MPEG-4standard, using, e.g., the ITU-TH. 245 standard, while receiving thecall control information, such as the SDP information prescribed by IETFRFC, from the second terminal 302.

The transcoder (converter) 350 is made up by a picture transcoder and aspeech transcoder.

In the above configuration, the control information converter 320extracts the first ability information, pertinent to, e.g., a codec,mounted on the first terminal 301, from the decoding informationreceived from the first terminal 301, while extracting the secondability information, pertinent to, e.g., a codec, mounted on the secondterminal 301, from the call control information received from the secondterminal 302.

The control information converter 320 then determines whether or not thefirst ability information and the second ability information coincidewith each other. If the first ability information and the second abilityinformation do not coincide with each other, the control informationconverter causes the transcoder (converter) 350 to be booted. Dependingon the state of non-coincidence of the ability information, thetranscoder (converter) 350 performs processing by the picture transcoderand/or by the speech transcoder.

As an example, a case where the first ability information and the secondability information are not coincident with each other, such that thepicture transcoder is booted, will now be explained. The transcoder(converter) 350 effects stream conversion so that a video stream encodedfor compression by one of the terminals will become decodable by thecounterpart side terminal. The transcoder then outputs the so convertedstream. For example, assume that the H.263 video codec and the MPEG-4video codec are mounted on the second terminal 302 and on the firstterminal 301, respectively. The picture transcoder transcodes the H.263stream, received from the second terminal 302 over the secondtransmitting/receiving unit 131, into the MPEG-4 stream, and outputs theso produced MPEG-4 stream to the first terminal 301 over the firsttransmitting/receiving unit 121.

With the present embodiment, described above, the converter(s) (at leastone of the picture transcoder and the speech transcoder) is booted incase the first ability information and the second ability informationare not coincident with each other, so that, even if the two terminalsdiffer from each other as to the ability, such as that of the codec, itis possible for the two terminals to have picture/speech communicationwith each other.

A fourth embodiment of the present invention, including a converter(transcoder) in the converting apparatus, will now be explained. Thecomponents of the fourth embodiment which are the same as those of thefirst to the third embodiments are omitted in the explanation forsimplicity. FIG. 4 depicts a block diagram showing the configuration ofan apparatus for converting the control information according to thefourth embodiment of the present invention. Specifically, FIG. 4 shows aconverting apparatus 400, arranged between a first terminal 301 and asecond terminal 302. In the following explanation, it is assumed againthat the first terminal 301 is connected to a circuit-switched networkand the second terminal 302 is connected to an IP network, as in theprevious embodiments.

The converting apparatus 400 includes a control information converter420, a transcoder 450, an ability information converter 460, firsttransmitting/receiving units 120, 121 and second transmitting/receivingunits 130, 131. The converting apparatus receives decoding information,such as DCI of the MPEG-4 standard, from the first terminal 301, using,e.g., the ITU-TH. 245 standard, while receiving call controlinformation, such as the SDP information prescribed by IETF RFC, fromthe second terminal 302.

In the above configuration, the control information converter 420extracts the first ability information, pertinent to, e.g., a codec,mounted on the first terminal 301, from the decoding informationreceived from the first terminal 301, while extracting the secondability information, pertinent to, e.g., a codec, mounted on the secondterminal 302, from the call control information received from the secondterminal 302.

The control information converter 420 then verifies whether or not thefirst ability information and the second ability information coincidewith each other. If the two information do not coincide with each other,the control information converter 420 further checks whether or not thetwo terminals coincide with each other as to the picture format sizeand, depending on the result of check, performs the followingprocessing.

First, in case the picture format size in one of the direction from thefirst terminal 301 to the second terminal 302 and the direction viceversa is not coincident, but the picture format size in the otherdirection is coincident, only the transcoder 450 for the non-coincidentdirection, here the picture transcoder, is booted to convert the picturestream. As for the direction of coincidence in the picture format size,a necessary part of the DCI of decoding information or controlinformation (for example, a part of the level information) or anecessary part of the DCI in the picture stream, is converted by theability information converter 460 and output.

Thus, with the present embodiment, in case the ability informationreceived from the first terminal is not coincident with that receivedfrom the second terminal, but the picture size is coincident in one ofthe two directions, part of the decoding information or controlinformation or part of the decoding information in the picture stream isconverted, in place of performing the converter operation, as long asthe direction of the picture size coincidence is concerned. Hence, thevolume of calculations may be decreased as compared to the case of thethird embodiment in which processing through the converter isnecessarily carried out.

A fifth embodiment of the present invention, including a converter(transcoder), in the converting apparatus, will now be explained. Thecomponents of the fifth embodiment which are the same as those of thefirst to the fourth embodiments are omitted in the explanation forsimplicity. FIG. 5 depicts a block diagram showing the configuration ofan apparatus for converting the control information according to thefifth embodiment of the present invention. Specifically, FIG. 5 shows aconverting apparatus 500, arranged between a first terminal 301 and asecond terminal 302. In the following explanation, it is assumed thatthe first terminal 301 is connected to a circuit-switched network andthe second terminal 302 is connected to an IP network, as in theprevious embodiments.

The converting apparatus 500 includes a control information converter520, an ability information converter 560, first transmitting/receivingunits 120, 121 and second transmitting/receiving units 130, 131. Theconverting apparatus receives decoding information, such as DCI of theMPEG-4 standard, using, e.g., the ITU-TH. 245 standard, while receivingcall control information, such as the SDP information prescribed by IETFRFC, from the second terminal 302.

In the above configuration, the control information converter 520extracts the first ability information, pertinent to, e.g., a codec,mounted on the first terminal 301, from the decoding informationreceived from the first terminal 301, while extracting the secondability information, pertinent to, e.g., a codec, mounted on the secondterminal 302, from the call control information received from the secondterminal 302.

The control information converter 420 then verifies whether or not thefirst ability information and the second ability information coincidewith each other. If the two information do not coincide with each other,the control information converter further checks whether or not thepicture format sizes of the two terminals coincide with each other and,depending on the result of check, performs the following processing.

First, in case the picture format size of the two terminals iscoincident as to a direction from the first terminal 301 to the secondterminal 302 and as to a direction from the second terminal 302 to thefirst terminal 301, a necessary part of the DCI of the decodinginformation or control information, for example, a part of levelinformation, or a necessary part of the DCI in the picture stream, isconverted by the ability information converter 560 for both directions,and output.

Thus, with the present embodiment, even in case the ability informationreceived from the first terminal is not coincident with that receivedfrom the second terminal, but the picture size is coincident in the twodirections, part of the decoding information or control information orpart of the decoding information in the picture stream is converted, inplace of performing the converter operation, for both the directions,and output. Hence, the volume of calculations may be decreased ascompared to the case of the third embodiment in which processing isnecessarily through the converter.

In the foregoing, description has been made of several embodiments ofthe present invention. It should be noted however that, as will beapparent from the principle of the invention, the technical scope of thepresent invention is not limited to the embodiments described, and thatvarious modifications or substitutions may be made without departingfrom the scope of the invention which resides in the configuration ofproviding for the communications between terminals belonging todifferent sorts of the networks.

It should be noted that other objects, features and aspects of thepresent invention will become apparent in the entire disclosure and thatmodifications may be done without departing the gist and scope of thepresent invention as disclosed herein and claimed as appended herewith.

Also it should be noted that any combination of the disclosed and/orclaimed elements, matters and/or items may fall under the modificationsaforementioned.

1. An apparatus for converting control information or the mediainformation for picture/speech communication between first and secondterminals connected to respective different types of networks,comprising a converter for effecting converting processing in a firstdirection for converting decoding information acquired from said firstterminal into call control information to output the resulting callcontrol information to said second terminal; and for effectingconverting processing in a second direction for converting call controlinformation acquired from said second terminal into decoding informationto output the resulting decoding information to said first terminal; andfor converting a bit stream, encoded for compression on said first orsecond terminal belonging to a given one of the networks, so that saidencoded bit stream will be decodable on said first or second terminalside belonging to the other network; said converter being booted in casea first ability information, inclusive of a picture format size, asextracted from the decoding information received from said firstterminal, and a second ability information, inclusive of a pictureformat size, as extracted from the call control information receivedfrom said second terminal, are not coincident to each other.
 2. Theapparatus for converting control information or media information asdefined in claim 1 wherein, if the first ability information and thesecond ability information are non-coincident with each other but thepicture format size of said first ability information coincides with thepicture format size of said second ability information, in one of saidfirst and second directions, said converter effects convertingprocessing of converting a preset part of the receiver side informationof said decoding information and said call control information, in placeof booting said converter.
 3. The apparatus for converting controlinformation or media information as defined in claim 1 wherein, if thefirst and second ability information are non-coincident with each otherbut the picture format size of said first ability information coincideswith the picture format size of said second ability information in bothof said first and second directions, said converter effects theconverting processing of converting a preset part of said decodinginformation and a preset part of the call control information, in placeof booting said converter.
 4. The method for converting controlinformation or media information as defined in claim 1 wherein, inacquiring the decoding information from said first terminal, at leastITU-T Recommendations H.245 protocol is used.
 5. The method forconverting control information or media information as defined in claim1 wherein Session Description Protocol SDP of IETF RecommendationsRFC2327 is used as the call control information output to said secondterminal.
 6. An apparatus for converting control information or themedia information for picture/speech communication between first andsecond terminals connected to respective different types of networks,comprising a converter for effecting converting processing in a firstdirection for converting decoding information acquired from said firstterminal into call control information to output the resulting callcontrol information to said second terminal; and for effectingconverting processing in a second direction for converting call controlinformation acquired from said second terminal into decoding informationto output the resulting decoding information to said first terminal; andfor converting a bit stream, encoded for compression on said first orsecond terminal belonging to a given one of the networks, so that saidencoded bit stream will be decodable on said first or second terminalside belonging to the other network; wherein ability negotiation betweensaid first and second terminals is mediated using the controlinformation included in the decoding information and the call controlinformation received by each of said terminals, said converter beingbooted in case a first ability information, inclusive of a pictureformat size, as extracted from the decoding information received fromsaid first terminal, and a second ability information, inclusive of apicture format size, as extracted from the call control informationreceived from said second terminal, are not coincident to each other. 7.The apparatus for converting control information or media information asdefined in claim 6 wherein, if the first ability information and thesecond ability information are non-coincident with each other but thepicture format size of said first ability information coincides with thepicture format size of said second ability information, in one of saidfirst and second directions, said converter effects convertingprocessing of converting a preset part of the receiver side informationof said decoding information and said call control information, in placeof booting said converter.
 8. A method for converting controlinformation or media information for picture/speech communicationbetween first and second terminals connected to respective differenttypes of networks, comprising a first converting step of a convertingapparatus, provided between said terminals, for converting decodinginformation acquired from said first terminal into call controlinformation, to output the resulting call control information to saidsecond terminal; and a second converting step of said convertingapparatus, for converting the call control information acquired fromsaid second terminal into the decoding information, to output theresulting decoding information to said first terminal; wherein aconverter provided to said converting apparatus is booted in case thefirst ability information, inclusive of a picture format size, asextracted from the decoding information received from said firstterminal, and the second ability information, inclusive of a pictureformat size, as extracted from the call control information receivedfrom said second terminal, are not coincident to each other; saidconverter booted converting a bit stream, encoded for compression onsaid first or second terminal connected to one of said networks, so thatthe bit stream encoded will be decodable on said first or secondterminal belonging to the other network.
 9. The method for convertingcontrol information or media information as defined in claim 8 wherein,if the first and second ability information are non-coincident with eachother but the picture format size of said first ability informationcoincides with the picture format size of said second abilityinformation, in one of the direction from said first terminal towardssaid second terminal and the direction from the second terminal towardssaid first terminal, said converter effects converting processing ofconverting a preset part of the receiver side information of saiddecoding information and said call control information, in place ofbooting said converter.
 10. The method for converting controlinformation or media information as defined in claim 8 wherein, if thefirst and second ability information are non-coincident with each otherbut the picture format size of said first ability information coincideswith the picture format size of said second ability information in thedirection from said first terminal towards the second terminal and inthe direction from said second terminal towards said first terminal,said converter effects converting processing of converting a preset partof said decoding information and said call control information, in placeof booting said converter.
 11. The method for converting controlinformation or media information as defined in claim 8 wherein, inacquiring the decoding information from said first terminal, at leastITU-T Recommendations H.245 protocol is used.
 12. The method forconverting control information or media information as defined in claim8 wherein the Session Description Protocol SDP of the IETFRecommendations RFC2327 is used as the call control information outputto said second terminal.
 13. A method for converting control informationor media information for picture/speech communication between first andsecond terminals connected to respective different types of networks,comprising a first converting step of a converting apparatus, providedbetween said terminals, for converting decoding information acquiredfrom said first terminal into call control information, to output theresulting call control information to said second terminal; and a secondconverting step of said converting apparatus, for converting the callcontrol information acquired from said second terminal into the decodinginformation, to output the resulting decoding information to said firstterminal; wherein ability negotiation between said first and secondterminals is mediated using the control information included in thedecoding information and the call control information received by eachof said terminals; and wherein a converter provided to said convertingapparatus is booted in case the first ability information, inclusive ofa picture format size, as extracted from the decoding informationreceived from said first terminal, and the second ability information,inclusive of a picture format size, as extracted from the call controlinformation received from said second terminal, are not coincident toeach other; said converter booted converting a bit stream, encoded forcompression on said first or second terminal connected to one of saidnetworks, so that the bit stream encoded will be decodable on said firstor second terminal belonging to the other network.
 14. The method forconverting control information or media information as defined in claim13 wherein, if the first and second ability information arenon-coincident with each other but the picture format size of said firstability information coincides with the picture format size of saidsecond ability information, in one of the direction from said firstterminal towards said second terminal and the direction from the secondterminal towards said first terminal, said converter effects convertingprocessing of converting a preset part of the receiver side informationof said decoding information and said call control information, in placeof booting said converter.